Restructuring (Schedule of Restructuring Charges) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring expenses, net
Restructuring expenses, net	$ 2,905	$ 15,570	$ 13,491
Machine Clothing [Member]
Restructuring expenses, net
Restructuring expenses, net	1,129	12,278	3,429
Engineered Composites [Member]
Restructuring expenses, net
Restructuring expenses, net	1,833	3,048	10,062
Termination and Other Costs [Member]
Restructuring expenses, net
Restructuring expenses, net	1,269	13,420	7,949
Termination and Other Costs [Member] | Machine Clothing [Member]
Restructuring expenses, net
Restructuring expenses, net	667	11,890	2,945
Termination and Other Costs [Member] | Engineered Composites [Member]
Restructuring expenses, net
Restructuring expenses, net	659	1,286	5,004
Impairment of Plant and Equipment [Member]
Restructuring expenses, net
Restructuring expenses, net	1,636	2,150	5,542
Impairment of Plant and Equipment [Member] | Machine Clothing [Member]
Restructuring expenses, net
Restructuring expenses, net	462	388	484
Impairment of Plant and Equipment [Member] | Engineered Composites [Member]
Restructuring expenses, net
Restructuring expenses, net	1,174	1,762	5,058
Corporate Expenses [Member]
Restructuring expenses, net
Restructuring expenses, net	(57)	244
Corporate Expenses [Member] | Termination and Other Costs [Member]
Restructuring expenses, net
Restructuring expenses, net	(57)	244
Corporate Expenses [Member] | Impairment of Plant and Equipment [Member]
Restructuring expenses, net
Restructuring expenses, net